OCCT

puts "============"
puts "OCC25220"
puts "============"
puts ""
######################################################
# Using BRepFill_OffsetWire with wires containing arc edges throws exception "Standard_NullValue"
######################################################

restore [locate_data_file bug25220.brep] a

mkoffset r a 1 -5

checkprops r_1 -l 939.882

set info [checksection r_1]

if { [regexp "nb alone Vertices : 0" ${info}] != 1 } {
  puts "Error: Result of offset is incorrect"
} else {
  puts "OK : Result of offset is correct"
} 

smallview
fit
checkview -screenshot -2d -path ${imagedir}/${casename}.png